Robinia pseudoacacia, in English known as the black locust, is a tree of the genus Robinia, named after the French botanist Jean Robin, who introduced the tree to Europe in 1601.

In France we are used to the common name Acacia or, more accurately, Robinier. In mai the trees flower and the white abundant flowers show us how common they are in forests and along the roads. The common name Acacia is well known for the transparant, deliciously flavored acacia honey.

The wood has a pale yellowish color, sometimes with pistachio green lines. Exposed to the sunlight it turns to a reddish brown. It is resistant to rot, due to the Flavonoids in the heartwood, which allow the wood to last over 100 years in soil. We see it often used to make fence posts.

Although it is a North American genus, traces of Robinia are found in the Eocene and Miocene rocks of Europe.

By a strange telescoping between common names and scientific names, there is confusion in the names of three kinds: the genera Acacia, Robinia and Mimosa. Indeed, the species called Mimosa in everyday language has the genus name Acacia, when what we call Acacia is actually Robinia, belonging to the Fabaceae family, subfamily Mimosoidea.